Internal combustion engine



Sept. 15, 1931. c. 5. BROWN 1,823,027

INTERNAL COMBUSTION ENGINE Filed Oct. 13, 1925 2 Sheets-Sheet l A TTORNEYS,

'INVENTOR.

Sept. 15, 1931. Q c. SQBROWN 3 K INTERNAL COMBUSTION ENGINE Filed 001:. 13, 1925 2 Sheets-Sheet 2 l w \w w;

INVENTOR.

' f' A TTORNEYS.

Patented Sept. 15, 1931 UNITED STATES CHARLES S. BRO'W' N, 0F SYRACUSE, NEW YORK INTERNAL COMBUSTION ENGINE Application filed. October 13, 1825. Serial No. 62,256.

This invention relates to internal combustion engines and more particularly to air cooled internal combustion engines and has for its object a particularly simple and eiiicient means for cooling the interior of the engines by drawing or circulating a cooling air current through the crank case.

The invention consists in the novel features and in the combinations and constructions hereinafter set forth and claimed.

In describing this invention reference is had to the accompanying drawings in which like characters designate corresponding parts in all the views.

Figure 1 is a side elevation, partly in section, of an air cooled engine embodying my invention.

Figure 2 is a front elevation of the radiator.

Figure 3 is a detail view of the fan which circulates air through the crank case and the radiator..

This internal combustion engine comprises, generally, a crank case, cylinders mounted on the crank case a crank shaft mounted in bearings in the crank case, the cylinders opening into the crank case in the usual man her and means for passing or circulating a cooling current of air through the crank case.

1 designates the crank case.

2 are the cylinders mounted on the crank case and opening thereinto.

3 is the crank shaft journaled in bearings in the crank case and connected to pistons which move in the cylinders in any Well known manner by connecting rods not shown. The cylinders are formed with suitable heat radiating flanges or other means 4, and a cooling air current is passed over the cylinders through an air conduit 5 which communicates with the fan casing 6 located at one end of the engine and housing a centrifugal fan 7 connected to the crank shaft.

During rotation of the fan 7, air is forced through the air conduit 5 and over the cylinders 2 through the cooling fins 4:. These fins a are also formed to provide jackets around the cylinders. I

The means for circulating a cooling current of air through the crank case includes a fan Sconnected to the crank shaft to be actuated thereby. The fan 8 is located in a suitable housing 9 which communicates with the crank case 1. As here illustrated, the fan 8 is part of the fly wheel 10 and mounted on the rear end of the crank shaft and the fan7 is also here illustrated as mounted directly on the crank shaft on the front end thereof.

The fan casing 9 is connected by a pipe 11 00 to the upper end of a radiator 12 located in frontof the engine and the radiator 12 communicates by a pipe 13 with an air inlet to the crank case located near the front end of the crank case. The radiator is located rela- 85 tively to the entrance 14: of the fan casing 6 so that air circulates through the radiator.

The radiator may be of any suitable form, size and construction and as here shown includes upper and lower heads 12a, 12b and tubes 15 connecting the heads, the pipe 11 opening into the upper head 12a and the pipe 13 leading from the lower head 12?). p The lower head is also formed with an opening 16 I that serves as air inlet passage to the fan ms ing 6, that is, the opening 16 permits air to pass directly to the inlet 14 of the fan casing 6. Usually this opening 16 is restricted to less capacity than the fan 7 sothat part of the air drawn by the fan 7 passes through the radiator;

In use, the movement of the Vehicle is probably suificientto create a suflicient air current passing through the radiator or between the tubes 15 thereof to cool the air or othe1 creating an air current through or betWeen the tubes of the radiator.

In operation, the heated air or oil mist and vapor in the crank case are drawn off by the fan 8 and circulated through the radiator where they are cooled and again passed through the crank case. During such circulation the oil mist or vapor greatly facilitates the cooling of the cylinders, pistons, connecting rods, etc., by coming in contact therewith.

In the engine, the cylinders are cooled exter nally by air and also internally and although I have shown this invention as combined with an air cooling system, obviously, it can be combined with a water cooling system to internally cool the crank case, cylinders and pistons of the engine.

By the term air herein when referring to that circulated by the fan 8, is meant the atmosphere drawn through the crank case with or without the oil therein.

What I claim is:

1. In an internal combustion engine, a crank case, cylinders and a crank shaft, fans mounted on opposite ends of the crank shaft, a casing around the front fan and an air conduit leading from the casing over the cylinders to supply a cooling air current to the cylinders, a casing around the second fan having an. inlet communicating with the interior of the crank casing, an outlet conduit leading from the casing, an air cooling radiator in front of the engine to which the outlet for the rear fan is connected, the air inlet for the crank case being also connected to the inte- 7. rior of the radiator and the radiator being arranged in juxtaposition to the front fan whereby the air is drawn past the tubes of the radiator by the front fan.

2. In an internal combustion engine, a

crank case, a crank mounted in the case, the

case having inlet and outlet passages located at, opposite ends of the crank case below the ends of the cylinders mounted on the crank case, and a fan mounted at the rear end of the crank shaft and having its intake side communicating with said outlet to draw air through the crank case, a radiator mounted in front of the engine, a pipe connecting the radiator and the inlet of the crank case, and 40. a pipe connecting the outlet of the fan and the radiator, whereby the air circulated through the crank case passes through a closed system.

In testimony whereof, I have hereunto signed my name, at Syracuse, in the county of Onondaga, and State of New York, this 16th day of September, 1925.

- CHAS. S. BROWN. 

